The Long Period of 3He-rich Solar Energetic Particles Measured by Solar Orbiter on 2020 November 17-23

TL;DR

This study reports a prolonged period of 3He-rich solar energetic particles observed by Solar Orbiter, linked to EUV jets near active regions, revealing insights into particle injections and solar magnetic activity.

Contribution

It provides new observations of long-duration 3He-rich SEP events and links them to specific solar active region configurations and jet activities.

Findings

Long period of 3He-rich SEPs observed by Solar Orbiter.

Ion injections coincide with EUV jets near active regions.

Extended SEP period related to complex sunspot group configuration.

Abstract

We report observations of a relatively long period of 3He-rich solar energetic particles (SEPs) measured by Solar Orbiter. The period consists of several well-resolved ion injections. The high-resolution STEREO-A imaging observations reveal that the injections coincide with EUV jets/brightenings near the east limb, not far from the nominal magnetic connection of Solar Orbiter. The jets originated in two adjacent, large, and complex active regions as observed by the Solar Dynamics Observatory when the regions rotated to the Earth's view. It appears that the sustained ion injections were related to the complex configuration of the sunspot group and the long period of 3He-rich SEPs to the longitudinal extent covered by the group during the analyzed time period.